Dynamics of multiple elements in fast decomposing vegetable residues

Cao, Chun1; Liu, Si-Qi2; Ma, Zhen-Bang3; Lin, Yun4; Su, Qiong5; Chen, Huan6; Wang, Jun-Jian7

2018-03

10.1016/j.scitotenv.2017.10.287

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Litter decomposition regulates the cycling of nutrients and toxicants but is poorly studied in farmlands. To understand the unavoidable in-situ decomposition process, we quantified the dynamics of C, H, N, As, Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Mn, Na, Ni, Pb, and Zn during a 180-d decomposition study in leafy lettuce (Lactuca sativa var. longifoliaf) and rape (Brassica chinensis) residues in a wastewater-irrigated farmland in northwestern China. Different from most studied natural ecosystems, the managed vegetable farmland had a much faster litter decomposition rate (half-life of 18-60 d), and interestingly, faster decomposition of roots relative to leaves for both the vegetables. Faster root decomposition can be explained by the initial biochemical composition (more O-alkyl C and less alkyl and aromatic C) but not the C/N stoichiometry. Multi-element dynamics varied greatly, with C, H, N, K, and Na being highly released (remaining proportion < 20%), Ca, Cd, Cr, Mg, Ni, and Zn released, and As, Cu, Fe, Hg, Mn, and Pb possibly accumulated. Although vegetable residues serve as temporary sinks of some metal(loid)s, their fast decomposition, particularly for the O-alkyl-C-rich leafy-lettuce roots, suggest that toxic metal(loid) s can be released from residues, which therefore become secondary pollution sources. (c) 2017 Elsevier B.V. All rights reserved.

Litter decomposition Nutrient release Heavy metal pollution Accumulation Roots Shoots Litters

SCI ; EI

英语

通讯

National Natural Science Foundation of China[41761074] ; National Natural Science Foundation of China[41401204]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000424121800062

ELSEVIER SCIENCE BV

20174604404602

Dynamics ; Farms ; Heavy metals ; Nutrients ; Pollution ; Vegetables

Metallurgy and Metallography:531 ; Chemical Reactions:802.2 ; Agricultural Equipment and Methods; Vegetation and Pest Control:821 ; Agricultural Products:821.4

ENVIRONMENT/ECOLOGY

Web of Science

1.Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Gansu, Peoples R China
2.Peking Univ, Shenzhen Grad Sch, Sch Environm & Energy, Key Lab Heavy Met Pollut Control & Reutilizat, Shenzhen 518055, Peoples R China
3.Lanzhou Univ, Coll Earth & Environm Sci, Lanzhou 730000, Gansu, Peoples R China
4.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA
5.Texas A&M Univ, Water Management & Hydrol Sci, College Stn, TX 77843 USA
6.Clemson Univ, Belle W Baruch Inst Coastal Ecol & Forest Sci, Clemson, SC 29442 USA
7.Southern Univ Sci & Technol China, Sch Environm Sci & Engn, Guangdong Key Lab Soil & Groundwater Pollut Contr, Shenzhen 518055, Guangdong, Peoples R China

Cao, Chun,Liu, Si-Qi,Ma, Zhen-Bang,et al. Dynamics of multiple elements in fast decomposing vegetable residues[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,616:614-621.

Cao, Chun.,Liu, Si-Qi.,Ma, Zhen-Bang.,Lin, Yun.,Su, Qiong.,...&Wang, Jun-Jian.(2018).Dynamics of multiple elements in fast decomposing vegetable residues.SCIENCE OF THE TOTAL ENVIRONMENT,616,614-621.

Cao, Chun,et al."Dynamics of multiple elements in fast decomposing vegetable residues".SCIENCE OF THE TOTAL ENVIRONMENT 616(2018):614-621.